7.16
SEL-751A Relay
Instruction Manual
Date Code 20100129
Communications
SEL ASCII Protocol and Commands
See the
SEL-751A Relay Command Summary
at the end of this manual for the
commands available from Access Level 2.
Any of the Access Level 1 commands are also available in Access Level 2.
Command Summary
The
SEL-751A Relay Command Summary
at the end of this manual lists the
serial port commands alphabetically. Much of the information available from
the serial port commands is also available via the front-panel pushbuttons.
Access Level
Functions
The serial port commands at the different access levels offer varying levels of
control:
➤
The Access Level 0 commands provide the first layer of
security. In addition, Access Level 0 supports several
commands required by SEL communications processors.
➤
The Access Level 1 commands are primarily for reviewing
information only (settings, metering, etc.), not changing it.
➤
The Access Level 2 commands are primarily for changing relay
settings.
The SEL-751A responds with
Invalid Access Level
when a command is
entered from an access level lower than the specified access level for the
command. The relay responds with
Invalid Command
to commands that are
not available or are entered incorrectly.
Header
Many of the command responses display the following header at the
beginning:
[RID Setting]
Date: mm/dd/yyyy
Time: hh:mm:ss.sss
[TID Setting]
Time Source: external
lists the header items and their definitions.
Table 7.5
Command Response Header Definitions
Item
Definition
[RID Setting]
:
This is the RID (Relay Identifier) setting. The relay ships with the
default setting
RID = 751A
; see
[TID Setting]
:
This is the TID (Terminal Identifier) setting. The relay ships with
the default setting
TID = FEEDER RELAY
; see
Date
:
This is the date when the command response was given, except for
relay response to the
EVE
command (Event), when it is the date
the event occurred. You can modify the date display format
(Month/Day/Year, Year/Month/Day, or Day/Month/Year) by
changing the DATE_F relay setting.
Time
:
This is the time when the command response was given, except for
relay response to the
EVE
command, when it is the time the event
occurred.
Time Source
:
This is internal if no time-code input is attached and external if an
input is attached.
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